<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

/**
 * 缓存管理类
 * @category   Think
 * @package  Think
 * @subpackage  Core
 * @author    liu21st <liu21st@gmail.com>
 */
class Cache {

	/**
	 * 操作句柄
	 * @var string
	 * @access protected
	 */
	protected $handler    ;

	/**
	 * 缓存连接参数
	 * @var integer
	 * @access protected
	 */
	protected $options = array();

	/**
	 * 连接缓存
	 * @access public
	 * @param string $type 缓存类型
	 * @param array $options  配置数组
	 * @return object
	 */
	public function connect($type='',$options=array()) {
		if(empty($type))  $type = C('DATA_CACHE_TYPE');
		$type  = strtolower(trim($type));
		$class = 'Cache'.ucwords($type);
		if(class_exists($class))
		$cache = new $class($options);
		else
		throw_exception(L('_CACHE_TYPE_INVALID_').':'.$type);
		return $cache;
	}

	public function __get($name) {
		return $this->get($name);
	}

	public function __set($name,$value) {
		return $this->set($name,$value);
	}

	public function __unset($name) {
		$this->rm($name);
	}
	public function setOptions($name,$value) {
		$this->options[$name]   =   $value;
	}

	public function getOptions($name) {
		return $this->options[$name];
	}

	/**
	 * 取得缓存类实例
	 * @static
	 * @access public
	 * @return mixed
	 */
	static function getInstance() {
		$param = func_get_args();
		return get_instance_of(__CLASS__,'connect',$param);
	}

	/**
	 * 队列缓存
	 * @access protected
	 * @param string $key 队列名
	 * @return mixed
	 */
	//
	protected function queue($key) {
		static $_handler = array(
            'file'  =>  array('F','F'),
            'xcache'=>  array('xcache_get','xcache_set'),
            'apc'   =>  array('apc_fetch','apc_store'),
		);
		$queue  =  isset($this->options['queue'])?$this->options['queue']:'file';
		$fun    =  isset($_handler[$queue])?$_handler[$queue]:$_handler['file'];
		$queue_name=isset($this->options['queue_name'])?$this->options['queue_name']:'think_queue';
		$value  =  $fun[0]($queue_name);
		if(!$value) {
			$value   =  array();
		}
		// 进列
		if(false===array_search($key, $value))  array_push($value,$key);
		if(count($value) > $this->options['length']) {
			// 出列
			$key =  array_shift($value);
			// 删除缓存
			$this->rm($key);
			if(APP_DEUBG){
				//调试模式下，记录出列次数
				N($queue_name.'_out_times',1,true);
			}
		}
		return $fun[1]($queue_name,$value);
	}

	public function __call($method,$args){
		//调用缓存类型自己的方法
		if(method_exists($this->handler, $method)){
			return call_user_func_array(array($this->handler,$method), $args);
		}else{
			throw_exception(__CLASS__.':'.$method.L('_METHOD_NOT_EXIST_'));
			return;
		}
	}
}